package contest1609;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.PrintWriter;
import java.util.Scanner;

public class EVector {
    static int[] v = new int[100000];
    static int top = -1;
    static Scanner cin = new Scanner(new BufferedInputStream(System.in));//大量输入优化版本
    static PrintWriter cout = new PrintWriter(new BufferedOutputStream(System.out));//大量输出优化版本
    static PrintWriter cerr = new PrintWriter(System.err, true);//开启调试模式,一般输出量不大，不需要buffered

    public static void main(String[] args) {
        //TODO AOJ开启你的ACM传奇人生
        cerr.println("----Start your ACM legendary life with AOJ(www.webturing.com)----");
        int q = cin.nextInt();
        while (q-- > 0) {
            int d = cin.nextInt();
            if (d == 0) {
                v[++top] = cin.nextInt();
            } else if (d == 1) {
                int p = cin.nextInt();
                cout.println(v[p]);
            } else {
                --top;
            }
        }

        cin.close();//关闭输入流
        cout.close();//关闭输出流，这是必须的，否则一般不会自动刷新缓冲区

    }
}